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Exam 13: Water Resources

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Question 51

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Global competition for water to grow food will result in food shortages and hunger among the wealthier nations of the world.

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Question 52

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Currently, desalination plants meet about 12% of the world's water needs.

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Question 53

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Water percolating downward until it comes to an impenetrable layer of rock is called groundwater.

Agriculture consumes ____________________ of the water withdrawn in California, much of it used inefficiently for growing crops in desert-like condition of the southern half of the state.

Of the world's 177 longest rivers, only ____________________ of them run freely all the way to the sea.

The water table for parts of the massive Ogallala aquifer has dropped as much as ____ meters as a result of the water being withdrawn for irrigation.

Despite advances in technology, desalination is still not cheap enough to make it useful for most irrigation or drinking water.

The United States unnecessarily wastes approximately how much of the water it withdraws from groundwater and surface supplies?

Dams have significant advantages, and significant disadvantages.Compare and contrast these advantages and disadvantages and explain whether you think dams are an appropriate tool for dealing with fresh water.

Because of greatly increased irrigation, Africa's Lake Chad has shrunk by ____% since the 1960s.

One of the major human activities that has contributed to flooding is

Groundwater overdrafts near coastal areas can contaminate aquifers with ____________________.

Affluent lifestyles use a lot of water.For example, how much water does it take to make one automobile?

Despite the heavy withdrawals of water from the Colorado River, most of its water reaches the Gulf of California.

Access to water issue for all of humanity. The authors list four of those issues. Which of the following is not one of those issues?

Water is a national security issue.

Reverse osmosis is the only practical method of desalination.

One of the most important and effective ways to reduce flooding is to

One method of desalination uses high pressure to force saltwater through a membrane filter.This method is called

The advantages of withdrawing groundwater include all of the following except